Related Experiment Videos
CtBP family proteins: more than transcriptional corepressors
1Institute for Molecular Virology, Saint Louis University School of Medicine, 3681 Park Avenue, St. Louis, Missouri 63110, USA. chinnag@slu.edu
Abstract:
CtBP family proteins predominantly function as transcriptional corepressors. Studies with mutant mouse suggest that the two mouse genes, Ctbp1 and Ctbp2, play unique and redundant gene regulatory roles during development.1 Ctbp1-deficient mice are viable, but are small and die early, while Ctbp2 deficiency leads to embryonic lethality. Ctbp2-null mutation causes defects in axial patterning, heart morphogenesis and neural development. The Ctbp2 mutant phenotype is more severe in the absence of Ctbp1. The studies with Ctbp2 mutant embryos suggest that CtBP can also activate transcription. A plant CtBP homolog, Angustifolia (AN), has recently been identified.2,3 AN controls polar elongation of leaf cells via the microtubule cytoskeleton. Microarray analysis suggests that AN also functions as a transcriptional repressor. Thus, the CtBP family proteins control cellular processes by serving as transcriptional activators and regulators of the cytoskeleton as well as transcriptional corepressors.
Insights
The CtBP protein family acts as transcriptional corepressors and regulators of cell structure. Mouse studies reveal unique and overlapping roles for Ctbp1 and Ctbp2 in development, impacting survival and organ formation.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- CtBP family proteins are primarily known as transcriptional corepressors.
- Studies indicate unique and redundant gene regulatory roles for mouse Ctbp1 and Ctbp2 during development.
- Ctbp2-null mutations result in embryonic lethality with defects in axial patterning, heart, and neural development.
Purpose of the Study:
- To investigate the diverse functions of CtBP family proteins.
- To elucidate the specific and overlapping roles of Ctbp1 and Ctbp2 in mouse development.
- To explore the potential transcriptional activation roles of CtBP and its homolog in plants.
Main Methods:
- Analysis of mutant mouse models (Ctbp1-deficient and Ctbp2-null).
- Phenotypic characterization of mutant embryos and mice.
- Identification and analysis of plant CtBP homolog (Angustifolia).
- Microarray analysis to assess gene expression.
Main Results:
- Ctbp1 deficiency leads to smaller size and early death in mice.
- Ctbp2 deficiency causes embryonic lethality and developmental defects.
- Combined deficiency of Ctbp1 and Ctbp2 exacerbates mutant phenotypes.
- Evidence suggests CtBP can also function as a transcriptional activator.
- Plant CtBP homolog (Angustifolia) regulates cell elongation via the cytoskeleton and acts as a repressor.
Conclusions:
- CtBP family proteins possess multifaceted roles, acting as transcriptional corepressors, activators, and cytoskeleton regulators.
- Ctbp1 and Ctbp2 exhibit distinct and overlapping functions essential for mammalian development.
- The conserved nature of CtBP function extends from plants to mammals, highlighting its fundamental biological importance.